Manufacture of bodies of reenforced concrete



Patented Nev. 7, ram. l,d3,5

ERNST MAIER, OF VIENNA, AUSTRIA.

MANUFACTURE OF BODIES F REENFORCED CONCRETE.

No Drawing. Application filed October 26, 1920. Serial No. 419,783.

To all whom it may concern: closed vessel, has immediately after (this Be it known that I, ERNST MAIER, residing treatment the same supporting capacity as 40 at Vienna, in the Province of Lower Austria, has a stone moulded at the same time and State of Austria, have invented certain new in quite a similar manner after a setting in and useful Improvements in or Relating to air of six weeks. It is obvious that the conthe Manufacture of Bodies of Reenforced ditions under which the bodies of reenforced Concrete; and I do hereby declare the folconcrete are set or hardened by the action 45 lowing to be a full, clear, and exact descripof steam under pressure may be varied action of the invention, such as Will enable cording to the quality of material employed others skilled in the art to which it apperand to the degree of setting as may be detains to make and use the same. sired in any special case.

My invention relates to improvements in I am aware that is has already been pro- 50 the manufacture of bodies of reenforced posed to harden bricks of chalky sandstone concrete and more particularly to a process or of cement with steam under a pressure up of setting or hardening all kinds of bodies to 6 atmospheres, but as far as I am aware or elements made of reenforced concrete for articles or bodies made of reenforced con building purposes, such as beams, ceilings crete never have been set or hardened as I 55 stairs, shaped stones and the like. propose to do it.

The process according to this invention By means of the process, it is possible to consists in treating bodies made of reenharden reenforced concrete bodies in a short forced concrete in a closed vessel with steam time and to produce an article superior to of about 9 kg. cm during a certain period that produced by the usual air hardening. 60 of time so as to set or harden the concrete Preferably dry steam is used in the process. to any desired degree, such bodies being Having now particularly described and introduced into the vessel and treated as ascertained the nature of my invention, I

indicated, after a primary setting of the declare that WhatI claim is: concrete in the moulds to such an extent The process of hardening bodies of reen- 65 that the bodies may be conveyed to the vesforced concrete, which comprises molding sel without jeopardizing theirshape. the said bodies, permitting the concrete to The time of treatment with steam and the partially set, and afterwards subjecting said height of pressure of the 'stea are chosen odies to the action of steam under pressure according to the kind of mate ial used and of substantially nine atmospheres, during 70 to the desired degree of harde ing. a period of substantially nine hours.

Various experiments have s own that for In testimony whereof I afiix my signature.

instance a stone made of reenforced concrete, after three days of moulding, being ERNST MAIER' exposed. during 9 hours to the action of Wltnessz steam of 9 atmospheres of pressure in a 4 SIEGFRIED NEURTA, 

